Abstract
Reproduction suppression properties in Zanthoxylum zanthoxyloides (Lam.) Waterm. (Rutaceae) root bark powder (ZRBP) against the cowpea seed bruchid (CSB), Callosobruchus maculatus F., were evaluated against neem ( Azadirachta indica A. Juss.) seed powder (NSP) and pirimiphos-methyl (PM) (Actellic 2% Dust, ICI). At application rates ranging from 0.125 to 3 g per 20 g seed, ZRBP was as effective an oviposition suppressant as PM, due to high contact toxicity to CSB adults, but significantly more effective than NSP. At the rate of 0.25 g per 20 g seed, ZRBP, NSP and PM had nearly 5 months residual effectiveness, preserved seed germinated fairly well (up to 70% germination in ZRBP treated seeds) and had no objectionable taste when cooked.
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